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Condensed Consolidated Statements of Operations (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Revenue:        
License and collaboration revenue $ 2,299 $ 893 $ 4,898 $ 18,917
Operating expenses:        
Research and development 20,352 12,249 52,754 38,419
General and administrative 4,869 3,833 14,799 11,895
Total operating expenses 27,528 16,993 72,479 57,446
Loss from operations (25,229) (16,100) (67,581) (38,529)
Interest and other income (expense), net (9) 67 (23) 1,195
Net loss $ (25,238) $ (16,033) $ (67,604) $ (37,334)
Net loss per share attributable to common stockholders, basic and diluted $ (0.80) $ (0.73) $ (2.23) $ (2.05)
Shares used to compute net loss per share attributable to common stockholders, basic and diluted 31,379,755 22,072,243 30,382,231 18,199,575
License        
Revenue:        
License and collaboration revenue   $ 32   $ 15,100
Collaboration        
Revenue:        
License and collaboration revenue $ 2,299 861 $ 4,898 3,817
Cost of license        
Operating expenses:        
Cost of license and collaboration   32   3,102
Cost of collaboration        
Operating expenses:        
Cost of license and collaboration $ 2,307 $ 879 $ 4,926 $ 4,030